1. Net Weight: 100g
2. Sound-activated mode
3. Able to dial back automatically the mobile number for monitoring when under sound-activated mode
2. GSM Band: 900/1800/1900MHz, can be applied in most countries (expect Japan and Korea)
3. Standby Time: 3-5 days on sound-activated mode
4. Incompatible with CMDA,3G sim card
5. No noise while starting and working
6. Able to catch the voice of radius of 5m